Greg Olsen, American football player
Greg Salas, American football player
Greg Biffle, American race car driver
Greg Laurie, American evangelist
Greg Inglis, Australian Rugby League player
Greg Lutzka, American pro skateboarder GregoryPhillip "Greg" Grunberg, American actor
Greg Rusedski, British-Canadian tennis player
Greg Norman, Australian golfer
Greg Maddux, American baseball pitcher Gregory "Greg" Horan, brother of Niall Horan of One Direction (who's not actually a celebrity)
Greg McHugh, Scottish actor, comdian, writer
Greg Heffley, main character in the Diary of a Wimpy Kid series
Greg Kleinschmidt, character in movie "The Invention of Lying" DI Greg Lestrade, character on TV's "Sherlock"
Good Guy Greg, Internet meme
Greg Carlyle, character on TV's "The Client List"